Leucocytosis after Lufenuron in cats

24 reports to the FDA describe leucocytosis in cats given Lufenuron. That is 2.2% of all reports for this medicine, compared with 0.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

24Reports

0.0%Marked serious

0.0%Recovered

21%Died or euthanised

–Typical onset

How the animals did

Died

5 21%

Not known

19 79%

Problems reported at the same time

13 54%

13 54%

9 38%

6 25%

Elevated globulins

6 25%

Weight loss

6 25%

Death

5 21%

Polycythaemia

4 17%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Lufenuron stops flea eggs from developing.

Questions owners ask

Can Lufenuron cause leucocytosis in cats?: 24 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Leucocytosis with similar medicines

Leucocytosis after Spinosad (Comfortis) 29 reports · 0.3% of its reports
Leucocytosis after Nitenpyram (Capstar) 28 reports · 0.3% of its reports
Leucocytosis after Imidacloprid + Moxidectin (Advantage Multi) 24 reports · 0.3% of its reports

All reported side effects of Lufenuron in cats · Medicines most reported with leucocytosis